The purpose of this essay is to show that this simple principle, combined with the principles of statistical mechanics, has profound implications for the very earliest history of the universe, at least if we impose the condition that the final state of our universe will be empty dS spaceThere have been lots of claims in the literature that quantum gravity does not admit a stable dS space. Only those claims which claim the instability sets in on time scales shorter than the time for our local group of galaxies to collapse into a black hole would modify the predictions of this paper for times before that collapse occurs .. As we'll review, this implies that any state of the universe, which contains localized excitations, is a low entropy constrained state. In a universe with no localized excitations, the entropy of the state in any causal diamond is always maximal and there is no interesting cosmological evolution. If, as appears to be true in our own universe, the asymptotic future state has finite entropy then the results of[1]} show that the system is uniquely modeled by a flat FRW universe with scale factor
\( a(t) = \sinh ^{1/3} (3t/R) , \) 
